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How Japan ranks worldwide on dormant space, the transfer market, routing security and address density.
PeeringDB-registered presence.
APNIC-measured end-user deployment.
Clean prefixes (valid RPKI + IRR, no mismatch).
Cumulative IPv4, IPv6, and ASN allocations to Japan over time.
The largest autonomous systems registered to Japan by IPv4 footprint.
Share of announced address space covered by valid Route Origin Authorizations.
1,303 autonomous systems registered to Japan. Click an AS for detail.
| 668 |
| AS17506JP | UCOM - ARTERIA Networks Corporation | 5.5M | 41 |
| AS2497JP | IIJ - Internet Initiative Japan Inc. | 4.2M | 269 |
| AS2527JP | So-net - Sony Network Communications Inc. | 3.9M | 76 |
| AS2518JP | BIGLOBE - BIGLOBE Inc. | 3.7M | 35 |
| AS17511JP | OPTAGE - OPTAGE Inc. | 3M | 68 |
| 92.9K |
| 4 |
| 133 |
| AS18150JP | SNI-JP - NetComBB Co.,Ltd. | 91.1K | — | 7 |
| AS4678JP | FINE - Canon IT Solutions Inc. | 91.1K | 65.5K | 5 |
| AS9993JP | CTC-ODC - ITOCHU Techno-Solutions Corporation | 91.1K | 65.5K | 10 |
| AS9378JP | CABLENET - JCOM Co., Ltd. | 90.1K | — | 36 |
| AS24282JP | KIR - KAGOYA JAPAN Inc. | 89.1K | 65.5K | 8 |
| AS18136JP | CTA - JCOM Co., Ltd. | 86K | — | 18 |
| AS9466JP | UUNET-JP-AP - UUNET Japan Limited | 84.5K | 512 | 23 |
| AS131161JP | NECCN - NEC Corporation | 83.2K | 69.6K | 9 |
| AS9600JP | SONYTELECOM - So-net Corporation | 82.9K | 65.5K | 16 |
| AS18092JP | CSF - Kyushu Tele Communications Company | 80.1K | 65.5K | 51 |
| AS18260JP | e-catv - EHIME CATV CO.,LTD. | 79.6K | 65.5K | 28 |
| AS7511JP | SYNAPSE - SYNAPSE Co.,Ltd. | 78.8K | 65.5K | 20 |
| AS38628JP | WINK-NET - HIMEJI CABLE TELEVISION CORPORATION | 77.8K | 65.5K | 17 |
| AS9621JP | II-OKINAWA - Okinawa Telecommunication Network Co.,Inc | 76.8K | 65.5K | 15 |
| AS7672JP | FITWEB - Hokuden Information System Service Co.,Ltd. | 76.8K | 65.5K | 21 |
| AS2505JP | HEPNET-J - High Energy Accelerator Research Organization, KEK | 74.2K | — | 4 |
| AS2523JP | ITRC-NET - Internet Technology Research Consortium | 73.7K | 65.5K | 4 |
| AS10000JP | NCM - Nagasaki Cable Media Inc. | 73.7K | 65.5K | 21 |
| AS23781JP | Toyama-AN-AS - Toyama University | 72.7K | — | 4 |
| AS59127JP | NCV - Newmedia Corporation | 71.7K | 81.9K | 21 |
| AS9615JP | TEES - TOYOHASHI CABLE NETWORK INC. | 71.7K | — | 10 |
| AS17939JP | MCN-NET01 - miyazaki cabletelevision network Co.,LTD | 71.7K | 65.5K | 11 |
| AS38654JP | INES-NETWORK - INES Corporation. | 69.6K | — | 5 |
| AS17947JP | S-UTOPIA - SAKURA KCS Corporation. | 69.6K | — | 2 |
| AS4730JP | ODINS - Osaka University | 67.6K | — | 2 |
| AS55391JP | MF-NATIVE6-E - INTERNET MULTIFEED CO. | 67.6K | 1.1M | 7 |
| AS55392JP | MF-NATIVE6-W - INTERNET MULTIFEED CO. | 67.6K | 1.1M | 7 |
| AS38634JP | DWANGO - DWANGO Co.,Ltd. | 67.1K | — | 4 |
| AS9366JP | SOLITON - SOLITON-NET | 66.8K | — | 6 |
| AS23816JP | YAHOO - LY Corporation | 66.6K | 65.5K | 8 |
| AS37919JP | SEGASAMMY - SEGA SAMMY HOLDINGS INC. | 66.6K | 1 | 3 |
| AS23720JP | RMNI-AS-AP - Rakuten Mobile Network, Inc. | 66.6K | 65.5K | 4 |
| AS150363JP | THIN-NET - SoftEther Corporation | 66.3K | — | 3 |
| AS24261JP | mie-u - Mie University | 66.3K | — | 3 |
| AS150359JP | CTTNET - Cable Television TOYAMA Inc. | 66K | 65.5K | 3 |
| AS131158JP | NAIST-AS - Nara Institute of Science and Technology, National University Corporation | 66K | 1 | 3 |
| AS9367JP | ISCT - Institute of Science Tokyo | 65.8K | 65.5K | 3 |
| AS9591JP | NIFS - National Institute for Fusion Science | 65.8K | — | 2 |
| AS17932JP | JAIST - Japan Advanced Institute of Science and Technology | 65.8K | 1 | 3 |
| AS37910JP | CUNET - Chubu University | 65.5K | — | 1 |
| AS17510JP | ISID - INFORMATION SERVICES INTERNATIONAL - DENTSU, LTD. | 65.5K | — | 1 |
| AS9593JP | NIKKEI - Nikkei Inc. | 65.5K | — | 1 |
| AS23807JP | RITSUMEI - Ritsumeikan University | 65.5K | — | 1 |
| AS131930JP | TBS-NET - Tokyo Broadcasting System Television, Inc. | 65.5K | — | 1 |
| AS2513JP | JST - Japan Science and Technology Agency | 65.5K | — | 1 |
| AS131897JP | EHIME-U - National University Corporation ,Ehime University | 65.5K | — | 1 |